impenetrableness
词形变化：
副词: impenetrably | 名词: impenetrableness |
同义词：
dense | impassable | unintelligible | inaccessible | unapproachable | unclear | obscure | vague | abstruse | deep | enigmatic | thick | solid | impermeable | dark | incomprehensible | unsolvable | unfathomable | indecipherable | inscrutable | cryptic | heavy |
反义词：